Door-check.



W. D. PUTNAM.

DOOR CHECK.

APPLICATION FILED AUG.4, 1914.

Patented June 1, 1915.

7HE NORRIS PETERS C0.. PHUTDLITHO.. WASHINGTON. C. C,

WALDO D. PUTNAM, 0F NEW YORK, N. Y.

DOOR-CHECK.

Specication of Letters Patent.

Patented J une 1, 1915.

Application led August 4, 1914. Serial N o. 854,917.

for cushioning the impact of the doorat thev termination of the closing movement, and

also for cushioning the-latched door on its rebound from such impact.

I VThe invention consists in certain novel features of construction and arrangement by which the above objects are attained, to be hereinafter described and` claimed. rj

i The accompanying drawings form apart of this specification and show an approved form of the invention. .Y

-Figure 1 is an elevation of a portion `of a shaft-door, seen from the interiorof the shaft, equipped with the improved check and latch. The succeeding figuresare on a arger scale.

the check and latch and the immediately adjacent parts. Fig. '3 is a vertical section, partly in elevation, the line of section being indicated by the line 3 3 in Fig. 2. Fig. 4c is a horizontal section taken on thek line in Fig. 2, showing a portion of the door in plan view.

Similar letters Vof reference vindicate the same parts in vall the figures.

A A. are the side walls of an elevator shaft, B is a sliding door supported by hanger 'straps B1 from a sliding bar B2 running on antifriction balls between the tracks or rails B8 B3, all of which may be under'- stood to be of the usual or any approved construction.

On the inner face of the door near its closing edge is a rod C1 mounted to slide vertically in housings C2 C2, while held against rotation, and having a collar C3 serving as an abutment for a helical spring C1 inclosing the rod between such collar and the adjacent housing C2 lower end against such housing. The spring exerts its forcel to lift the rod, the

Fig. 2 is an elevation cor-` responding to aportion of Fig. l, shownig and abutting at theV upward movement being limited by the contact of a collar C5 with the housing.

At the upper end of the rod is a head or dog C extending horizontally, of wedge or V-shape with the sharp angle presented toward the closing edge of the door, and adapted to engage a swinging latch D loosely mounted on a horizontal shaft or bar D1 slidably supported in the lugs D2 D3 of a bracket D4 attached to the wall of the elevator shaft or other fixed portion of the shaft equipment. The bar D1 is arranged to slide endwise in either direction and is maintained in position `with the latch about midway between the lugs D2 D3 by helical springs D5 D, of equal tension, abutting against such lugs at their outer ends, and

at the inner ends against collars D7 D8 fixed n onthe bar D1 one on each side of the latch D. The ends of the bar D1 project through the lugs suiiciently to permit the required endwise movement without disengagement.

On the upper edge of the door is a vertical arm E located to strike the protruding end of the shaft D1 in the closing movement of the door.

The operation is as follows :-As the door approaches the closed position shown in the several figures, the angular face c of the dog C contacts with the angular face d of the latch D and swings the latter on the bar D1 to permit the passage of the dog, and engagesY the square rear face thereof to retain the door in the closed position. Immediately after Vsuch engagement the arm vE strikes the protruding end of the bar D1,

moves the latter endwise and compresses the spring D5 between the lug D2 and collar YD1, thus cushioning the closing movement and causing the door to'come to rest noiselessly and without shock. If in the closing movement the door has acquired suiiicient momentum to rebound after such cushioning, the rear face of the dog strikes the corresponding adjacent face of the latch with which it is engaged and moves the latter with the bar D1 in the opposite direction and compresses the spring D3 between the collar D8 and lug D3, thus softening the rebound whilev holding the door in the latched condition. The latch D has a nose D9 adapted to strike the under face of the bracket D4 and thus hold the latch with its angular face Z in position to receive the angular face c of the dog. Dlsengagement is effected by forcing the rod C1 downward inropposition to its spring C4 to a suicient distance to release the dog C from the latch D and to clear the latter inthe opening movement of the door.

The improved check and latch will serve advantageously with selffclosing` sliding ried by said bar and arranged to move therewith, a dog carried by thel door and adapted toI engage said latch in the closing move.- ment of such door and lock the latter, means carried by such door arranged to move said barendwise after the engagement of said dogand latch, `yielding means actuated by 'the movement of said bar in onel direction Vto cushion the closing movement of' such .do0r,..and yielding means actuated by the movement of said bar in the opposite direclatch and dog,and means actuated by such.-

tion toV cushion the rebound of such door after the engagement of said dog and latch.

'2; In a device ofthe character set forth, a bar mounted to slide endwise, a 'latch cari'iedbysaid bar, a dog carried by the door and'A adapted to engage said latch in the closing movement Vof such door, an arm on the latter arranged` to strike said bar and move it Yendwise after the engagement of .said

movement of :said bar `to arrest yieldingly the closing movement of saidv door.v Y

. 3. In a device ofthe character set forth, fa bracket, a barmounted to slide endwise therein, a latch carried by said bar, a dog carried` bythezdoor and adapted to engage said latch in*'the,closingmovementj of said n door, an arm on -theilatter arranged to strike said bar and movev it endwise after the en# gagement of said latch and dog, and springs arranged to resist yieldingly the endwise movement of said bar in either direction.

Ll. In a device of the character set forth,

a bracket, a bar mounted to slide endwiseV i therein, a latch carried by vsaid bar and mounted to swing thereon, springs on said bar, one on each side of said latch between the latter and said bracket, a kdog carried by the doorA and arranged'to contact with said latch in the closing movement of such door and to swing and engage said latch,

and an arm carried by such door arranged to strike said bar and move it endwise in vone direction against the forceof one of said springs after the engagement of said latch and dog, the other of said springs arranged to resist yieldingly an endwise movement of4 said bar in the opposite direction.

5. In a device ofthe character set forth,V va bracket having lugs thereon, a bar slidably mounted in-said lugs, a latch Vcarried by said bar andl mounted to'swing-thereon, a

collar onv said bar` on eachlside of'said latch,

each of'said collarsV and g said latch having an an- A a spring between itsvadjacent lug, gular face, a dog carriedby the door and having anangular face adapted in the closy ing movement of' such door` to contact with.,

the angularV face Voffs'aidv .latch andv swing' and YengageV the lattenandan arm lcarried` by suoli 'doorarranged to strike said bar,

and move it endwisefin one direction inopposition'to one of said springs and thereby Y cushion the closingmovement of suchA door,

the other of said springs arranged toiresist anendwise movement of saidbar in the.` opposite direction inducedthrough saiddog Yand'latch and thereby cushion la, reboundingV Vmovement Vof such door.V

In testimony thatfI claimthe inventionabove. set forthI afliX-my signature, in pres*- n ence Tof two witnesses. Y

`I/Vitnesseszy CHARLESR. SEARLE, `Hunan V. RICE.

C'Qpiesol this patent-my hefobtaned .for ive cents each, by addressingY thei Commissioner or Patents, Y v WashingtonJLG" Y wALijo iD. inifiiaiifiiif; 

